License, verbatimCC0
The Metropolitan Museum of Art: Open Access, Creative Commons Zero (CC0). Flagged isPublicDomain=true in the museum's own record.
Stefano della Bella. The columns of the Temple of Antoninus to right, a part of the Campo Vaccino in center and at left, along with various animals and figures, the Palatine ruins in the background, from "Six large views, four of Rome, and two of the Roman countryside" (Six grandes vues, dont quatre de Rome et deux de la Campagne romaine), 1656. The Metropolitan Museum of Art.